FeaturesDouble-Stitched: Traditional construction requiring very skilled labour. The upper and the sole unit are stitched together.Insulated: Additional insulation in the upper and the sole unit.An insulating layer added to the insole. For extra insulation at low temperatures.A winter sole that provides grip even on black ice. HANWAG IceGrip zones made of a special rubber compound with extremely fine glass particles literally claw into the surface of the ice, rather like sandpaper.High-quality cowhide from the Heinen Tannery in Germany. Tanning is carried out in accordance with strict environmental guidelines and using CO2 neutral energy.Lambswool: Natural insulation technology. Breathable, dirt-resistant, water-repellant and batericidal.